'''
Created on Oct 15, 2014

@author: azhelezny
'''

s = 'AGACTATATCCTCGTCAGTCCCTCCTAATTGAGTTTGTTCATATACTGCCATCGAATCGTACCTACCTGCGGGGTCTGTGCCCGTGGCGTTTTAACATGTAGGGCCGGGGCGTTAGCGGAAACCATTGAACTTTGGGGTATGAAAAGCACCCATTTAGGCTAGAGCAACAGGTGCGTATGACAATCCAAAGCCATCTTCCGCGTACTGTTCGGCTTTAATCGGCATCAGTGGTTGTGTTTCGTGTGGTTCCCTCATTCAGTATTCAAGCGTAAGCCAAAGCAGAGTATGGACCGGCAAACGCGGCTATAGAAGCAAATGAGGAAGTCACACACGCTACTCCAGCGAACGAGCATATATATTTCTGTCTCAGCGCGACACTCTACAAGGGTCTGTAAAGTCAGATTTGGGGGTATTACGCTCCAAAGTTTTCCGACGTCTGCGGATGAGCTCGTACGATATCGCTCGTGGGTGGCTCCCTTTAACGTGCGGCAGCGCCTATTAGTCCTTAGGCCCCCTCTCAACAATATCCAACCGACAAACGGAAGGCCGCCCTGTGTCAGTTGATAGTATTTTTCCAGTAAGGGCAACTCTAGCGATTCCAAGTCTACAAAGACTGGCCCGTCGCGGGAGCTATTATAAGTGGCAAACCTTCTTGAGACCACCCCAATCCTATTCGGTTCAACGTAGTGTCCAACAAACCAGAATAACACCCTTGGACGTGTGATTACGCAATGGGTAGATGTTCTTCATGGGAAAATCGGATACGGATAACAGTAGCCCATTCCTTCGCAGTAGCACGACCAACATCGTCCCCATCAGCTGTTTGACCATGCAAATGTGAATAGAGGTGAGAGCTGGAAGGCCAAAGTTCCCACAGTTCTAGTCGTACCGTCTGAACACGGTATTTCCGGGGTCCCTGTTTGCACGAGGCGGCCTTGTCGCATTGGTATGGGGATCACGAAATAAGCACGCACTAAAGTCCTCTACT'
t = 'AGTCCCCGTGCTATTTAGTTACTTCTTCCTGCGGATCCGCATATCCAGCAATCGAATTGTACCTATCTATTCGCTCTGTCTTCTCAGAAGGTTAAAATGTGGCGCCGCGGAGTCTGGAGTCTGCATTGGCCTTTCGGGGAAGACCAACATCCGACTAGGCTAGGGCGGCCGGTGCCCATAACTGTCCTGAACCATAGCCCAGGGACATTTGGCCTTGATTCGGCATGTTGTTTTGAGTGATTAGGGGCGCCCACCTGTACCAGTCTCGGAATGGTATTTGTGCATCGTTGACTGAATACCACGCTGATAGCGTATAGGCAGGACTTCACTCTCGCTTCTCCATAAGGGTAACATACATTCATCATTATTGTCTCCCTATTCTGCCTGGGTCTGTGAAGTCAGCTCAGGTTATACCAGCCTTGAGAATATTCTGTGACAATGGAGGGTGCGCGCCAGATATTGCTTGTGACCGAACCTGACTCCCTCCTTAGATTTCCTAGCTTCCCTACGTAAGGCTCTCGAATCTACCGCATTCCGAGGCCATCCTCCGTCTTATTGCAGTTGACATACGGATCCGAGAAGGGGCATCATTAACAGTCCCTGTACTCCTCTGGCGATCGATTTGCGACGCAAGTAAATTCGAGACCCTCATCGGCACATCAGTAACTGCTTCCCGTCTCGGTGCCATTGTCGAATAAAGTAGTAATCAATCCGTCTCCATGCTAATACGAACGCAGCCGAAGTAAAGACATGCGAATTAACAATTGCTAAGACTTAGCTAACCGGTCCGCACTACCGTCAATAGCAGCAGCTTCAGCCGCCATAACAGCTAGCAAATGTGACTAGCTATGAGCCGTTCCAGCGAAAAGTTGGCAATCTCCTATCGGCACCAACTAAGCGCGACGTCACGTTCATCCAAGGTCTCACAGGGCTCAGGGGTCCCAGTGGGGTGGTCAGTAGTTGGTTAGCACGCACAATAAACGCACACT'

mutations = 0
i = 0
while i < len(s):
    if(s[i] != t[i]):
        mutations +=1
    i += 1

print(format(mutations))